A Scientific Theory is a theory that explains scientific observations.
The Big Bang theory that the scientists used for our universe is a model of the universe's birth.
We know that the universe is expanding because in the past, the universe was much smaller than today. The expansion happens all around us and from a large scale that we don't even notice it happening on Earth.
Origin of the Universe:
A Scientific Theory is a theory that explains scientific observations.
The Big Bang theory that the scientists used for our universe is a model of the universe's birth.
We know that the universe is expanding because in the past, the universe was much smaller than today. The expansion happens all around us and from a large scale that we don't even notice it happening on Earth.